Clutch



1929- J. s. CARTWRIGHT ET AL CLUTCH Filed June 7, 1928 2 Sheets-Sheetfiwcnlars: James 51 Carlw rglufi, T lwmas Davey,

Dec. 17, 1929. J. s. CARTWRIGHT ET AL 1, 3

CLUTCH Filed June 7, 1928 2 Sheets-Sheet 2 Inventors: Jalnes S.Carlwrzght,

Ihoms'laveg,

Patented Dec. 17, 1929 UNITED STATES PATENT OFFICE 1 JAMES SHELDONCARTWRIGHT AND THOMAS DAVEY, F WINTHROP, MASSACHUSETTS CLUTCHApplication filed June 7, 1928. Serial No. 283,536.

This invention relates to clutches and has for its object the productionof a simple but eflective device of this character which may be appliedreadily to a sewing machine actuated by an electric motor.

This object is attained by the mechanism illustrated in the accompanyingdrawings.

For the purpose of illustrating the invention, one preferred formthereof is illustrated in the drawings, this form having been found togive satisfactory and reliable results, although it is to be understoodthat the various instrumentalities of which the invention consists canbe variously arranged and organ- "ized, and the invention is not limitedto the precise arrangement and organization of these instrumentalitiesas herein shown and described except as required by the scope of .theappended claims. Of the drawings:

Figure 1 represents a vertical section of a clutch embodying theprinciples of the present invention and showing in elevation a portionof a sewing machine and the motor for "driving same.

Figure 2 represents a section of same on line, 2,2, on Fig. 1. I

Figure 3 represents a plan of the expanding ring and a portion of thehub on which it 1s mounted.

Figure 4 represents a section on line 4, 4, on Fig. 3, and I Figure 5represents a vertical sectionon line 5, 5, on Fig. 1.

' Similar characters indicate like parts throughout the several figuresof the drawings.

In the drawings, 10 is a portion of theframe of a machine from whichextends the driving shaft 11 thereof.

This frame 10 is provided with a bracket 12 on the outer end of which ismounted an electric motor 13 which may be of any wellknown'construction.

The motor 13 is provided with a driving shaft 14 in alinement with theshaft 11, of the machine to be operated.

Secured to the driving shaft 14 is a collar 15 having pins 16 extendingtherefrom into A openings 16 in a disk 17 which is slidably mounted onthe shaft 14.

The hub of this disk 17 has an annular groove 18 in the peripherythereof into which project the trunnions 19 of a lever 20 pivoted at 21to the bracket 12.

The lever 20 has an arm 22 adjustably mounted thereon and clampedthereto in ad justed position by a bolt 23.

This arm 22 has a rearwardly extending bar 24 secured thereto by a pin25, the outer end of said bar being pivoted by pin 26 to alever-actuating rod 27, the lower end of which is connected to anysuitable operating device such as a treadle. 7

'As the treadle forms no part'of the present invention it is notconsidered necessary to illustrate the same.

'A spring 28 between the arm 22 and bracket 12 normally retains the disk17 in the position shown in Fig. 1.

When the motor 13 is in operationthe driving shaft 14 thereof willimpart rotary move ment to the reciprocating disk 17 by means of themembers 16 positioned in the openings 16 in the hub of said disk.

One face of the disk 17 is provided with a recess 28 in the bottomof-which is disposed a sheet 29 of cork or some similar material. g

The shaft 11 has secured thereto a flywheel 30 the hub 31 of which iscone-shaped with its outer end extending into the recess 28 of disk 29.

A plate 32 is secured to the hub 31 by means of screws 33 having heads34 adapted for reciprocation in depressions 35in said hub 31.

This plate 32 has limited movement towards and from the outer end of hub31 and under normal conditions is retained in a position slightlyseparated from thecork sheet 29 by means-of a spring 36, as shown inFig. 1.

When in 'thisposition the motor 13 may be driven without imparting anyrotary movement to the shaft 11.

The plate 32 has an annular flange 37 extending into an annular groove38 in a split ring 39 surrounding the hub 31 of flywheel 30."

i The width of the groove 38 is greater than the thickness of the flange37 thereby permitting the expansion of the split ring 39.

The inner face of this ring is tapered to conform to the cone-shapedperiphery of the hub 31 which has extending therefrom a wedge-shapedprojection 40, the opposite faces of which contact with the adjacentends of the splitring 39. i 1

When the split ring 39 is forced toward'the flywheel. 30 the inclinedfaces of the wedge 4,0 will expand the ring slightly, so that the'periphery thereof will be brought into frictional contact with the innercylindrical Wallof the recess 28*.

When the frictional contact is sufficient to bind the ring 39 and disk17 together the full speed of the motor shaft 14 will be imparted to thedriving shaft 11 of the machine.

Radial pins 41 in the split ring 39extend through slots 4:2 in theflange 37 to tie the ring and plate 32 together while permitting theexpansion of said ring 39'. I

The ring 39 is made of spring metal and will return to its normalposition when again moved outwardly on the hub 31.

The outer endof the arm 22 has an opening 43 extending therethrough inwhich is disposed the projection 44 of a plate 45 having friction disks46 secured thereto in depressions 47 "at opposite ends thereof A headedstud 48 secures 'a' .washer 49 to the outer end of; the projection 4.4which provided to insureboth pads tfi always con tacting with theflywheel 30,when it is de-, siredto-retardand stop the rotating of saidwheel. 8

l Vith the parts in the position indicated inFigi 1 of the drawings, themotor 13 can rotate without imparting any'rotary move ment torthedrivin-gshaft 11 but as soon as theoperatorractuates the treadle to movethe upper endgofithe lever 22 towards the left;

the friction pads-46" will beremoved from theiperiphery -ofthe-flywheeh30 and the cork sheet 29, will be forcexlginto contactv withthe plate 32.; within the recess 2 2,8? of the disk 17.

This gramm r contact between the. cork.

sheet 29 and the plate;..-32;will cause-the split the shaft 111, thisrotation, bein transmitted fl e-ugh he We g dmember Q ci ieh blof"thefiywheel thereby causing the latterto-rm tate and transmit a slowrotary movement to said shaft 11.

The continued movement of the lever 20 to the left will force the splitring toward the flywheel 30 and owing to the wedged shape of theprojection 40 this ring 39 will be expanded until its periphery comesinto contactwith the cylindricaLwall of :therecess 28* formed in thedisk 17 Further movement of the ring 39 to the leftof 1 ;willecause itto be firmly locked;

between the cone-shaped hub 31 of the flywheel 30 and said cylindricalwall so that the disk 17, the flywheel 30, and driving shaft 11 willrotate at the same speed as that of the shaft 14: of the motor 13. a a

As soon as the operator removes his foot from the treadle the spring 28will cause the lever 20 to move clockwiseabout its pivot 21, therebymoving the their 17 to the right. and

permitting the spring 36' to moveythe plate to its normalposition asindicated in Fig,.

1, at which time the spring of the metal. in

the split ring 39 will cause it to beremoved from contact withthecylindrical walliofthe.

recess 28*.

While the clutch parts-are being disen'ff gaged in the manner justdescribed, the fric tion pads 46 will be moved into contactj with theperiphery ofthe flywheel]30;to' retard further movement of saidflywheel-and then prevent all rotation thereof} It is believed that'theoperation and many; advantages of the invention will be under stoodwithout further description.

Having thus described our'invention, we claim 1'. The combination of twoalined' shafts; a flywheel on'one shaft'providedlwitha coneshaped hub; amotor to drive the other'shaft'; a disk slidable onand rotatable withthe mo tor shaft and provided with a cylindricaljrecess in one facethereof; a splitiring fittedgto and rotatable with said huh andidisposecl in said recess, said ring having an annular groove in itsouter face; a plate revoluble with said'hub having aflange extendinginto said groove; andawedge member onsaid-hub between the endsQfsaidringadapted toexv pand said ring when moved inwardly on said hub;

2; The combination 0ftw0-alined shafts a flywheel on one shaft providedwith, arf

coneshapedihuh; a motor to -drivevtheother shaft a 1 disk; slidahle onand rotatable with the motor shaft and providedfw ith'a;cylindriVcalrrecess in one face thereefjg; a, split ring fitted toirotatahle-with said vhuh and posed in 53161 1360855 sa d r ng -havingan an nular groove in its outer face r a-plat e revolu;

ble with said hub hav-ing a flange.,,extending intosaid groove; meansfor, limiting the out;

ward movement of said plateto prevent con tactv nde ormal onditian(with; he-bet:

m f ai frece s; landf dge. member on said hub between the ends of saidring adapted to expand said ring when moved inwardly on said hub.

3. The combination of two alined shafts; a flywheel on one shaftprovided with a coneshaped hub; a motor to drive the other shaft; a diskslidable on and rotatable with the motor shaft and provided with acylindrical reccss in one face thereof; a split ring fitted to androtatable with said hub and disposed in said recess, said ring having anannular groove in its outer face; aplate revoluble with said hub havinga flange extending into said groove; two screws secured to said plateand reciprocable in said hub and provided with heads to limit theoutward movement of the plate; and a wedge member on said hub betweenthe ends of said ring adapted to expand said ring when moved inwardly onsaid hub.

4:. The combination of two alined shafts; a flywheel on one shaftprovided with a coneshaped hub; a motor to drive the other shaft; a diskslidable on and rotatable with the motor shaft and provided with acylindrical recess in one face thereof; a split ring fitted to androtatable with said hub and disposed in said recess, said ring having anannular groove in its outer face; a plate rotatable with saidhub havinga flange extendinginto said groove, said flange having a thickness lessthan the width of said groove to permit the expansion of the split ring;and a wedge member on said hub between the ends of said ring adapted toexpand said ring when moved inwardly on said hub.

5. The combination of two alined shafts; a flywheel on one shaftprovided with a coneshaped hub; amotor to drive the other shaft; a diskslidable on and rotatable with the motor shaft and provided with acylindrical recess in one face thereof; a split ring tted to androtatable with said hub and disposed in said recess, said ring having anannular groove in its outer face; a plate rotatable with said hub havinga flange extending into said groove, said flange having a thickness lessthan the width of said groove to permit the expansion of the split ring;radial pins in said ring extending through slots in said flange; and awedge member on said hub between the ends of said ring adapted to expandsaid ring when moved inwardly on said hub.

('3. The combination of two alined shafts; a flywheel on one shaftprovided with a conesha'ped hub; a motor to drive the other shaft; adisk slidable on and rotatable with the motor shaft and provided with acylindrical recess in one face thereof; a split ring fitted to androtatable with said hub and disposed in said recess, said ring having anannular groove in its outer face; a plate revoluble with said hub havinga flange extending into said groove; a spring between said hub and plateto force the plate outwardly; means for limiting the outward movement ofsaid plate; and a wedge member on said hub between the ends of said ringadapted to expand said ring when moved inwardly on said hub.

r7. Thecombination of two alined shafts; a flywheel 011 one shaftprovided with a coneshaped hub; a motor to drive the other shaft; a diskslidable on and rotatable with the motor shaft and provided with acylindrical recess in one face thereof; a split ring fitted to androtatable with said hub and disposed in said recess, said ring having anannular groove in its outer face; a plate revoluble with said hub havinga flange extending into said groove; a sheet of resilient material inthe bottom of said recess normally free from contact with said plate;and a wedge member on said hub between the ends of said ring adapted toexpand said ring when moved inwardly on said hub.

8. The combination of two alined shafts; a flywheel on one shaftprovided with a coneshaped hub; a motor to drive the other shaft;

a disk slidable on and rotatable with the motor shaft and provided witha cylindrical recess in one face thereof; a split ring fitted to androtatable with said hub and disposed in said recess; means for movingsaiddisk end wise and expanding said ring into frictional contact withthe cylindrical wall of saidrecess; and a brake member operable by saidmoving means coacting with said flywheel when the clutch partsaredi'sengaged.

9. The combination of two alined shafts; a flywheel on one shaftprovided with a coneshaped hub; a motor to drive the other shaft; a diskslidable on and rotatable with the motor shaft and provided with acylindrical recess in one face thereof; a split ring fitted to androtatable with said hub and disposed in said recess; and means formoving said disk endwise and first imparting slow rotation to said huband then expanding said ring into frictional contact with thecylindrical wall of said recess to rotate the flywheel at full speed.

10. The combination of two alined shafts; a flywheel on one shaftprovided with a cone-shaped hub; a motor to drive the other shaft; adisk slidable on and rotatable with the motor shaft and provided with acylindrical recess in one face thereof; a split ring fitted to androtatable with said hub and disposed in said recess, said ring beingnormally free from contact with said disk; and means for moving saiddisk endwise and first imparting slow rotation to said hub and thenexpanding said ring into frictional contact with the cylindrical wall ofsaid recess to rotate the flywheel at full speed.

11. The combination of two alined shafts; a flywheel on one shaftprovided with a coneshaped hub; a motor to drive the other shaft; a diskslidable on and rotatable with the m0- tor shaft and provided with acylindrical recess in one' face thereof; a split ring-fitted to androtatable with said hub anddisposed.

in said recess; and means for moving said disk endWise of said motorshaft and" expanding saidiringinto frictional contact With thecylindrical wall of said recess.

12. The combination of two alinedshafts; a flywheel'on one'shaftprovided With-a coneshaped hub amotor to drive the other shaft; a: diskslida'ble-on and rotatable with the m0- tor shaft" and provided with a--cylindricalreoess in one face thereof;'a split ring-fitted to and;rotatable with said hub and I disposed in. said recess, said ring beingnormally free from contact: with said disk; andmeans for moving'saiddisk-endwise of said motor and expanding saidring into frictionalcontact with the cylndrical Wall ofsaid recess.

13'; Thecombination of two alined shafts; a member on one shaft providedwith a coneshaped :hub a motor to drive-the other shaft; another memberrotatable with the motorshaft; and provided'with a cylindrical recessinaoneefacethereof; a split ring fitted'to androtatable withisaidhub anddisposed in said recess; andmeans for moving one member endtvise. of;the shaft on which it is mounted and expanding said ringrinto frictionalcontactvwith thecylindrical Wall ofsaid recess. I

Signed'by usiati746 Qld South Building Boston .M'assachusetts, this 5thday of June,

' JAMES S. CARTVVRIGHT.

THOMAS DAVEY;

